How to convert PDF to Image Process

Hi, I am new in Joget. I want to Run Process whereby if User upload File Document ( pdf ) it will convert into Image (jpeg/png). I found that it is possible if doing Java hardcode project, however how can i  do it inside Joget?

package com.roytuts.java.pdf.to.image;

import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;

public class PdfToImageConverter {

    public static void main(String[] args) {
        try {
            String destinationDir = "pdf-to-image/";

            File sourceFile = new File("sample.pdf");
            File destinationFile = new File(destinationDir);

            if (!destinationFile.exists()) {
                destinationFile.mkdir();
                System.out.println("Folder Created -> " + destinationFile.getAbsolutePath());
            }

            if (sourceFile.exists()) {
                PDDocument document = PDDocument.load(sourceFile);
                PDFRenderer pdfRenderer = new PDFRenderer(document);

                String fileName = sourceFile.getName().replace(".pdf", "");

                // int pageNumber = 0;

                // for (PDPage page : document.getPages()) {
                for (int pageNumber = 0; pageNumber < document.getNumberOfPages(); ++pageNumber) {
                    BufferedImage bim = pdfRenderer.renderImage(pageNumber);

                    String destDir = destinationDir + fileName + "_" + pageNumber + ".png";

                    ImageIO.write(bim, "png", new File(destDir));
                }

                document.close();

                System.out.println("Image saved at -> " + destinationFile.getAbsolutePath());
            } else {
                System.err.println(sourceFile.getName() + " File does not exist");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}